When using GPS, how many theoretical...

Question 1 / 2707066636ee928f7522a1c51a53e

Question 1 of 2707066636ee928f7522a1c51a53e

When using GPS, how many theoretical position lines are required for a two-dimensional fix?

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Question 1 of 27070

Q

When using GPS, how many theoretical position lines are required for a two-dimensional fix?

🔍 Key Concepts

• 2D position fix on the Earth’s surface (latitude and longitude) • How many independent lines of position (LOPs) are needed to pinpoint a location in two dimensions • Relationship between satellite ranges and position lines in GPS

💭 Think About

• If each measurement (or line of position) reduces your unknowns by one, how many do you need to solve for a position defined by latitude and longitude? • On a traditional paper chart, how many crossing lines of position are normally used to mark a reliable fix? • In GPS, think of each satellite giving you a circle of possible positions on the Earth’s surface; how many such circles must intersect to give a single point in 2D?

✅ Before You Answer

• Clarify that a two-dimensional fix means only horizontal position (lat/long), not altitude • Remember that each line of position eliminates one degree of freedom • Confirm how many unknowns you are solving for in a 2D horizontal fix

Question 1 of 27070

Q

When using GPS, how many theoretical position lines are required for a two-dimensional fix?

A

1

B

2

C

3

D

4

Question 1 / 2707066636ee928f7522a1c51a53e

Question 1 of 2707066636ee928f7522a1c51a53e

When using GPS, how many theoretical position lines are required for a two-dimensional fix?

Back

Question 1 of 27070

Q

When using GPS, how many theoretical position lines are required for a two-dimensional fix?

🔍 Key Concepts

• 2D position fix on the Earth’s surface (latitude and longitude) • How many independent lines of position (LOPs) are needed to pinpoint a location in two dimensions • Relationship between satellite ranges and position lines in GPS

💭 Think About

• If each measurement (or line of position) reduces your unknowns by one, how many do you need to solve for a position defined by latitude and longitude? • On a traditional paper chart, how many crossing lines of position are normally used to mark a reliable fix? • In GPS, think of each satellite giving you a circle of possible positions on the Earth’s surface; how many such circles must intersect to give a single point in 2D?

✅ Before You Answer

• Clarify that a two-dimensional fix means only horizontal position (lat/long), not altitude • Remember that each line of position eliminates one degree of freedom • Confirm how many unknowns you are solving for in a 2D horizontal fix